The best way to find right crop factor

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The best way to find right crop factor

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Before you know how to find right crop factor, you need to know the definion of crop factor. It is common defined as the difference size between a 35mm film frame and your camera’s sensor.

The most common trick to find crop factor is converting the focal length to the full frame equivalent so, you can get the conversion of crop factor you need.

Another way is calculating the diagonal using Phtahgorean Theorem (a² + b² = c²), then divide the number by the diagonal of the crop sensor.

Here is the common focal length and crop factors, by resulting equivalent focal length :

1.5x 1.6x 2.0x 2.7x
14mm 21mm 22.4mm 28mm 37.8mm
18mm 27mm 28.8mm 36mm 48.6mm
24mm 36mm 38.4mm 48mm 64.8mm
35mm 52.5mm 56mm 70mm 94.5mm
50mm 75mm 80mm 100mm 135mm
85mm 127.5mm 136mm 170mm 229.5mm
105mm 157.5mm 168mm 210mm 283.5mm
200mm 300mm 320mm 400mm 540mm


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